VCM可以是下列意思：

• 氯乙烯单体
• 音圈马达（Voice Coil Motor）
• Virtual Channel Memory, 也就是SDRAM

Variable displacement is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi-cylinder engines. Many automobile manufacturers have adopted this technology as of 2005, although the concept has existed for some time prior to this.